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【单选题】
[6.7][TB-3] 《混凝土结构设计规范》规定,纵向钢筋弯起点的位置与按计算充分利用该钢筋截面之间的距离,不应小于( )A.
0.3
B.
0.4
C.
0.5
D.
0.6
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反馈参考答案：
举一反三
【简答题】Look at the picture, the electrode, the arc and the weld pool are sorrounded by the shielding gas. They have no chance to contact with air before the molten metal cools down and solidifies. That`s to ...
【判断题】The welding consumables include filler metal, flux, backing material, shielding gas etc.
A.
正确
B.
错误
【单选题】A suitable shielding gas may isolate the following except ________ from air.
A.
welding gun
B.
hot electrode
C.
the arc
D.
the weld pool
【简答题】A．Avoiding B．Fending C．Escaping D．Shielding
【简答题】A. Avoiding B. Fending C. Escaping D. Shielding
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